74lvt16646 Fairchild Semiconductor, 74lvt16646 Datasheet - Page 3

• Manufacturer Part Number: 74lvt16646
• Description: Low Voltage 16-bit Transceiver/register With 3-state Outputs
• Manufacturer: Fairchild Semiconductor

Functional Description
In the transceiver mode, data present at the HIGH imped-
ance port may be stored in either the A or B register or
both. The select (SAB
stored and real-time. The examples shown below demon-
strate the four fundamental bus-management functions
that can be performed.
OE DIR CPAB CPBA SAB SBA
OE DIR CPAB CPBA SAB SBA
L
L
L
H
L
L
Real-Time Transfer
Transfer Storage
Bus B to Bus A
Data to A or B
H or L
n
X
X
, SBA
H or L
n
X
X
) controls can multiplex
H
X
X
H
L
X
3
The direction control (DIR
receive data when OE
HIGH), A data may be stored in one register and/or B data
may be stored in the other register. When an output func-
tion is disabled, the input function is still enabled and may
be used to store and transmit data. Only one of the two
busses, A or B, may be driven at a time.
OE DIR CPAB CPBA SAB SBA
OE DIR CPAB CPBA SAB SBA
H
H
L
L
L
H
H
X
X
L
Real-Time Transfer
Bus A to Bus B
n
is LOW. In the isolation mode (OE


X
X
X
Storage
n
) determines which bus will


X
X
X
X
X
X
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L
L
X
X
X
X
L
n